I find it hard to believe those guns are chambered for 2 1/2” shells. Out of all my Parkers I only have one that is truly a 2 1/2” gun. That is a top-lever O frame 16g hammer gun. I’d get a good digital caliper to take your measurements. I was never a fan of those drop-in chamber and choke gauges.
One can always have the chambers lengthened if your BWT is good.
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